is it necessary to take the class mark ,if yes then why : Class - Maths - Statistics

Question

is it necessary to take the class mark ,if yes then why
?:

Class Interval
Frequency
Class Mark

50-100
9
75

100-150
3
125

150-200
12
175

200-250
17
225

Class - mark = Upper   limit   + Lower  
limit 2

Shruti Tyagi · Accepted Answer

Dear student,

Yes, if we have to find mean class mark (x) is necessary because
the formula of mean is
Mean  x=∑fx∑f for which x is required
Regards

is it necessary to take the class mark ,if yes then why ?: Class Interval Frequency Class Mark 50-100 9 75 100-150 3 125 150-200 12 175 200-250 17 225 Class - mark = Upper limit + Lower limit 2